请教大神,这段代码什么意思,js代码一直搞不懂

<script>
    var system ={
    win : false,
    mac : false,
    xll : false
    };

var p = navigator.platform;

system.win = p.indexOf('Win') == 0;

system.mac = p.indexOf('Mac') == 0;

system.x11 = (p == 'X11') || (p.indexOf('Linux') == 0);

if(system.win||system.mac||system.xll ||p=="Maclntel"){

}else{


}
  function searchInputClick(id){

var val = $("#" + id).val();

if(val=='输入中文/拼音'){

$("#" + id).val('');

}

_hmt.push(['_trackEvent', 'index_' + id, 'focus', id]);

}
</script>
<div class="bodyhead">
<div class="main-wrap">
  <h1 class="logo"><a href="http://xian.changtu.com/">西安汽车站电话</a></h1>
<style>
.navmenu li.ico em{position: absolute;background:url("http://cdn-resource.12308/2015/css/img/ico.gif") no-repeat 0px 15px;height:50px;left: 120px;top: -35px;width:65px;display:block;}
.navmenu li.ico a{color:#ff0;}
.navmenu li.ico a.cur{color:#0096ff;}
.navmenu li.ico a:hover{color:#f90;}
.navmenu li.ico a,.navmenu li.ico span,.navmenu li.ico i{/* transition:all 0.3s ease; */ transition: none;}
</style>

用户系统信息:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.22 Safari/537.36 SE 2.X MetaSr 1.0
最后编辑一朵小茉莉 最后编辑于 2016-11-16 09:22:25